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<?php
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namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
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use PhpOffice\PhpSpreadsheet\Calculation\Exception;
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use PhpOffice\PhpSpreadsheet\Calculation\Functions;
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use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
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class Gcd
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{
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    /**
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     * Recursively determine GCD.
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     *
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     * Returns the greatest common divisor of a series of numbers.
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     * The greatest common divisor is the largest integer that divides both
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     *        number1 and number2 without a remainder.
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     *
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     * Excel Function:
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     *        GCD(number1[,number2[, ...]])
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     *
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     * @param float|int $a
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     * @param float|int $b
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     *
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     * @return float|int
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     */
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    private static function evaluateGCD($a, $b)
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    {
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        return $b ? self::evaluateGCD($b, $a % $b) : $a;
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    }
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    /**
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     * GCD.
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     *
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     * Returns the greatest common divisor of a series of numbers.
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     * The greatest common divisor is the largest integer that divides both
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     *        number1 and number2 without a remainder.
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     *
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     * Excel Function:
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     *        GCD(number1[,number2[, ...]])
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     *
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     * @param mixed ...$args Data values
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     *
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     * @return float|int|string Greatest Common Divisor, or a string containing an error
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     */
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    public static function evaluate(...$args)
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    {
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        try {
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            $arrayArgs = [];
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            foreach (Functions::flattenArray($args) as $value1) {
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                if ($value1 !== null) {
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                    $value = Helpers::validateNumericNullSubstitution($value1, 1);
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                    Helpers::validateNotNegative($value);
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                    $arrayArgs[] = (int) $value;
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                }
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            }
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        } catch (Exception $e) {
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            return $e->getMessage();
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        }
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        if (count($arrayArgs) <= 0) {
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            return ExcelError::VALUE();
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        }
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        $gcd = (int) array_pop($arrayArgs);
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        do {
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            $gcd = self::evaluateGCD($gcd, (int) array_pop($arrayArgs));
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        } while (!empty($arrayArgs));
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        return $gcd;
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    }
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}